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Middle Miocene closure of the Central American Seaway

Montes, C. ; Cardona, A. ; Jaramillo, C. ; Pardo, A. ; Silva, J. C. ; Valencia, V. ; Ayala, C. ; Pérez-Angel, L. C. ; Rodriguez-Parra, L. A. ; Ramirez, V. ; Niño, H.

Science (American Association for the Advancement of Science), 2015-04, Vol.348 (6231), p.226-229 [Periódico revisado por pares]

United States: American Association for the Advancement of Science

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  • Título:
    Middle Miocene closure of the Central American Seaway
  • Autor: Montes, C. ; Cardona, A. ; Jaramillo, C. ; Pardo, A. ; Silva, J. C. ; Valencia, V. ; Ayala, C. ; Pérez-Angel, L. C. ; Rodriguez-Parra, L. A. ; Ramirez, V. ; Niño, H.
  • Assuntos: Closures ; Fingerprints ; Geochronology ; Minerals ; Ocean basins ; Oceans ; Strata ; Zircon
  • É parte de: Science (American Association for the Advancement of Science), 2015-04, Vol.348 (6231), p.226-229
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Uranium-lead geochronology in detrital zircons and provenance analyses in eight boreholes and two surface stratigraphic sections in the northern Andes provide insight into the time of closure of the Central American Seaway. The timing of this closure has been correlated with Plio-Pleistocene global oceanographic, atmospheric, and biotic events. We found that a uniquely Panamanian Eocene detrital zircon fingerprint is pronounced in middle Miocene fluvial and shallow marine strata cropping out in the northern Andes but is absent in underlying lower Miocene and Oligocene strata. We contend that this fingerprint demonstrates a fluvial connection, and therefore the absence of an intervening seaway, between the Panama arc and South America in middle Miocene times; the Central American Seaway had vanished by that time.
  • Editor: United States: American Association for the Advancement of Science
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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